mm ratchets

[bird]

Hi guys, I recently bought a bunch of tools from a guy around here.  This set was really interesting because they're metric. It reads  D.R.G.M and DRPa  any ideas about these???

[rusty]

DRGM is a German design registration (sort of like a patent) it changed to D.B.G.M after the war, so they are at least that old.

There should be a number after it....

DRP is a full actual patent
Unfortunatly, DRPa means "applied for", so you don't get a number...

Not easy to search these patents, especially with no date and no number :(

[bird]

thanks to all!  I haven't seen these ratchets before...  are they very common?

[bonneyman]

I've not seen metric ratcheting box ends old like those. I do have a set of old Dunlap's, but they are SAE.

I like them! Send them to me, and I'll give 'em a happy home!lol